Help me find a suitable speaker cable for my all McIntosh system

It really depends on the sound that you prefer. You need to listen to a few.

I found the copper choices from AQ were too smooth with my equipment the midlevel AQ with silver cleared it up (ie. Firebird & William Tell Silver biwire combo's. Since they are above my budget for 4ft lengths I have moved on to hear what the forum has to say based on their experience. 

Try out Darwin Cables. 

All the best,
Nonoise

@farne230 

I also have an all-McIntosh system, but I am powering KEFs. I had B&Ws in the past. Since both are warm, I can see how you want to change it up with silver. I have heard great things about Nordost Tyr 2 speaker cables. Slightly less performance than the Valhalla 2s. Might be a viable option.

I build my own speaker cables using Cat 8 OFC

this is all black,

8 strands 22 awg equivalent to 13 awg

8 strands 26 awg equivalent to 17 awg

https://www.wirebarn.com/Combined-Wire-Gauge-Calculator_ep_42.html

I found and used black and red; twist them, put WBT connectors